Mold-form.



JULIUS J. GR'UENFELD, JR., AND PAUL KIBCI-IER, OF CHICAGO, ILLINOIS,ASSIGNORS TO i MASSEY CONCRETE PRODUCT-S CORPORATION, 0F CHICAGO,ILLINOIS, A CORPORA- 'IION vOF VIRGIN IA..

MOLD-FORM.

Specification of Letters Patent.

Patented Apr. 15, 1919.

v Application filed May 28, 1918. Seria1No.235,8iO3.

T 0 all whom if may concern Be it known that we, JULiUs J. Gamin- FELD,Jr., and .PAUL Krimi-1ER, both citizens of the United States, residingat Chicago, in the county of Cook and State of Illinois, have inventedcertainnew and useful Improvements in Mold-Forms, of which the followingis a' specification.

This invention relates to a mold form for use in the making of kconcreteand other oementitious poles, and. has particular reference to means forforming step receiving recesses adapted to receive steps of the samegeneral character as that described and claimed in our co-pendingapplication Serial Numberl 235,802, filed May 21, 1918.

Our invention has for one of its primary Objects the provision of asimple mold form of the character described which can be readilystripped from' the completed pole without injury to or defacement of thefresh concrete. Our invention also contemplates a mold form "the partsof which may be quickly assembled or taken apart and which are firmlyheld in position during the forming of the pole, particularly where thepole is made by a rotary process.

The foregoing, together with such other objects as may hereinafterappear or are incident to our invention, we attain by means of aconstruction which we have illustrated in preferred form in theaccompanying drawings, wherein Figure 1 is a side elevation of a portionof a pole showing the step receiving parts thereof; Fig. 2 is across-section of the pole shown in Fig. 1; Fig. 3 is a section taken onthe line III-e111 of Fig. 1 with a step in position; Fig. l is across-section through the mold with the step recess forming p0rtions inposition; Fig. 5 is a side elevation of Fig. 4; Fig. 6 is a sectiontaken on the line VI-VI of Fig. 5; and Fig. 7 illustrates a modicationof our invention.

Referring now to the drawings, the pole, which may be of the hollow orsolid type, is indicated by the reference letter A, such pole havingarranged on alternate sides a plurality of recesses and apertures 8 inwhich the steps indicated as a whole at B in Fig. 3 are received. Suchsteps form no `part of the present invention being described and claimedin the aforo-mentioned application for Letters Patent. The top and sidewalls or edges of the recesses are curved or 4therethrough adaptedrounded Vand the bottom walls or edges thereof are sloped, as indicatedin the drawings, so that the recesses will be self-draining. Theapertures 8, which are preferably rectangular, are located at a pointbelow the middle 4of the recesses, in order to facilitate the insertionof the linemans spurs into the steps which are to be introduced andfastened in the apertures 8.

The mold C for making the poles is preferably divided longitudinaly in aplurality of parts, suoli parts being provided with 'flanges 9 adaptedto be secured together vat intervals by means of suitable bolts 10. Thesections or parts of the mold may be provided intermediate their endswith stiifening ribs 11. Secured to thev inner surface of the mold' andon alternate sides thereof are a plurality of cores 12 which are shapedto form the recesses 7 above described. The cores are secured to themold form by means of the screws or studs 13 and each core is providedwith `an aperture 141 extending to receive a plug 15 the end of whichprojects beyond the core Aso as to form the apertures 8. The cores 12are mounted so that the apertures 14 therein, come opposite similarapertures 16, formed in the mold wall, and the plug 15 is provided witha head or shoulder 17 which is adapted to take against the outer surfaceof the mold form and limit the inward movement of the plugs. The coresand plugs are so located that when the parts are assembled the head 17of the plugs will lie adjacent to the ribs 11 which are utilized as ameans for preventing the plugs from shifting out of position. In orderto accomplish this result the ribs are provided with apertures 18 andthe heads 17 of the plugs are provided with similar apertures 19 adaptedto receive the cotter pins Q0. This fastening means is particularlyuseful where the poles are formed by the rotary process as the cotterpinsprevent the plugs from working out under the action of thecentrifugal force developed. In order to remove the plugs we provideapertures 21 in the heads 17 adapted to re ceive a suitable form oftool.

The operation is as follows, assuming that the parts are assembled asshown in Fig. 4 and that the pole A the rotaryA or other method: Uponcompletion of the pole the cotter pins 20 are rst withdrawn and then theplugs 15 are withhas been formed by drawn. The plugs may be thuswithdrawn without defacing or injuring the fresh concrete as they willstrip through the aper# tures 14 in the cores 12. After the removal ofthe plugs the sections of the mold may be readily stripped.

In the modification shown in Fig. 7 the plugs 22, instead of beingremovable as in the arrangement already described, constitutea permanentVpart of the cores l2.

l. A mold form for making concrete poles comprising a shell having on.its inner j surface a plurality of cores arranged on alternate sidesand adapted to form recesses in the face ofthe pole, and removable plugsmounted in the cores, the inner ends Iof* which are adapted to projectinwardly beyond the cores. j j Y 2. VA mold form for making concretepoles comprising a shell and a4 plurality of removable plugs vmountedtherein alternately on opposite sides in such manner that the said`plugs have one end projecting inwardly into .Copies of this patent maybe obtained for the shell, and the other end outwardly therefrom, saidouter ends to the shell.-

3. A mold form for making concrete poles comprising in combination ashell, a plurality of cores on `the inner face of said shell, arrangedon alternate sides thereof,- shell and cores lbeing apertured, andremovable plugs adapted to be inserted in said apertures, the endswhereof are adapted to project inwardly beyond the cores.

4. A mold fr making concrete poles comprising in Combination Snell.having n pin. rainy of apnntnnen alternately arranged Aon; opposite sidesaid shell being provided with projections adjacent said apertures, aplurality' of pings npted to be removably inserted in apertures', theends whereof project inwnny within Snell, and means fon secnning saidpings' to said proj-nations.

In testimony" whereof, we have hereunto signed our franges.- ,j

JUL Us J.. GRNFELD, Je

PAUL Krnennn.

five' cene; eaqnty addressing* 15in #connais-innen nifnfents,washington, n. o.

and means for detac'hably securing said

